Introduction

1.3.3.3Remote Wake-Up

If a PC supports a reduced power state, it must be possible to bring the system to a fully powered state in which all management interfaces are available. Typically, the LAN adapter recognizes a special packet as a signal to wake up the system. This reference design utilizes a Wake on LAN (WOL) Header to provide standby power to the NIC and the interface for the wake up signal. The physical connection to the NIC and motherboard is via a WOL Cable provided with the design kit. See the WOL Header Recommendations document at:

ftp://download.intel.com/ial/wfm/wol_v14.pdf.

The system BIOS must enable the wake event and provide wake up status. The details of the BIOS requirements can be obtained from the Intel Corporation web site:

http://developer.intel.com/ial/WfM/design/rwudt/index.htm

1.3.3.4Power Management

WfM Baseline compliant systems have four distinct power states: Working, Sleeping, Soft Off, and Mechanical Off. Soft off is usually provided by a user accessible switch that will send a soft off request to the system. The PIIX4 provides the power button input for this purpose and implementation details are described in the schematics. A second optional “override” switch located in a less obvious place (or removal of the power cord) stops current flow forcing the platform into the mechanical off state without OS consent. Note that a second “override” switch is required for legal reasons in some jurisdictions (for example, some European countries). The BIOS may support the power management requirement either through the APM revision 1.2 or ACPI revision 1.0 specifications. This reference design’s BIOS implementation incorporates both interfaces. The PIIX4 provides hardware level register support for both the APM and ACPI specifications. See Intel's web site for additional information:

http://developer.intel.com/ial/WfM/design/pmdt/index.htm.

1.4Design Recommendations

1.4.1Voltage Definitions

For the purposes of this document the following nominal voltage definitions are used:

Vcc

5.0V

Vcc3.3

3.3V

VccCORE

Voltage is dependent on the five bit VID setting

Vcc2.5

2.5V

VTT

1.5V

VREF

1.0V

Intel®440GX AGPset Design Guide

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Intel 440GX manual Design Recommendations, Voltage Definitions, Remote Wake-Up, Power Management
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440GX specifications

The Intel 440GX chipset was launched in 1997 as part of Intel's series of chipsets known as the 440 family, and it served as a critical component for various Pentium II and Pentium III-based motherboard architectures. Specifically designed for the second generation of Intel’s processors, the 440GX delivered enhanced performance and supported a range of important technologies that defined PC architectures of its time.

One of the main features of the Intel 440GX was its support for a 100 MHz front-side bus (FSB), which significantly improved data transfer rates between the CPU and the memory subsystem. This advancement allowed the 440GX to accommodate both the original Pentium II processors as well as the later Pentium III chips, providing compatibility and flexibility for system builders and consumers alike.

The 440GX chipset included an integrated AGP (Accelerated Graphics Port) controller, which supported AGP 2x speeds. This enabled high-performance graphics cards to be utilized effectively, delivering many enhanced graphics capabilities for gaming and multimedia applications. The AGP interface was crucial at the time as it offered a dedicated pathway for graphics data, increasing bandwidth compared to traditional PCI slots.

In terms of memory support, the 440GX could address up to 512 MB of SDRAM, allowing systems built with this chipset to run comfortably with sufficient memory for the era’s demanding applications. The memory controller was capable of supporting both single and double-sided DIMMs, which provided versatility in memory configuration for system builders.

Another notable feature of the Intel 440GX was its support for multi-processor configurations through its Dual Processors support feature. This allowed enterprise and workstation computers to leverage the performance advantages of multiple CPUs, making the chipset suitable for business and professional environments where multitasking and high-performance computing were essential.

On the connectivity front, the chipset supported up to six PCI slots, enhancing peripheral device integration and expansion capabilities. It also included integrated IDE controllers, facilitating connections for hard drives and CD-ROM devices.

Overall, the Intel 440GX chipset represented a balanced combination of performance, flexibility, and technology advancements for its time. Its introduction helped establish a foundation for subsequent advancements in PC technology and set the stage for more powerful computing systems in the years to come.
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